Give the IUPAC name for each of the following, using cis or trans prefixes, if needed:

We are given structure of compounds. We need to write their IUPAC name.

As we can see there are five carbons in main chain so we will use "pent". it also contain double bonds so name will end with "ene".

We can see bulkier group on same side of double bond so we will use "cis" in prefix. Therefore,

IUPAC name is $cis-2-pentene$

We are given structure of compounds. We need to write their IUPAC name.

As we can see there are seven carbons in main chain so we will use "hept". it also contain double bonds so name will end with "ene".

We can see bulkier group on opposite side of double bond so we will use "trans" in prefix. Therefore,

IUPAC name is $trans-2-heptene$

We are given structure of compounds. We need to write their IUPAC name.

As we can see there are seven carbons in main chain so we will use "hept". it also contain double bonds so name will end with "ene".

We can see bulkier group on opposite side of double bond so we will use "trans" in prefix. Therefore,

IUPAC name is $trans-3-heptene$